zenith - summit, top, peak⏎
stringent - severe, very strict, strictly controlled⏎
retain - keep something, hold something back preserve⏎
vet - examine, check, screen (something or someone)⏎
role - function, position (of somebody)⏎
simulate - imitate, create artificially⏎
sole - only, one⏎
serve - provide, help, spend time, do duty for⏎
saturate - drench, overproduce, over supply⏎
unexpired - valid, remaining, still in force⏎